Autism has seen huge increases around the world in the past few decades

There are many proposed reasons for the increase; including
low Vitamin D, antibiotics, and Roundup

There are 27 reasons to associate Autism with low vitamin D

Children of women who had higher levels of vitamin D have lower risk of autism
(More Autism info below)

Learn how Vitamin D is essential for good health Watch a 5 minute video "Does Less Sun Mean more Disease?" Browse for other Health Problems and D in left column or here see also Supplementing and More in the menu at the top of very page

Animal study finds that suggests vitamin D may help prevent and treat autistic symptoms Vitamin D Council Feb 2016
". . . "if you want your children to be free of autism, we recommend both mom and dad supplement with 5,000 IU/day of vitamin D for at least 3 months before conception (this dose will also improve both male and female fertility). Then, the pregnant woman should remain on 5,000 IU/day, and perhaps 10,000 IU/day, which is the No Observed Adverse Effects Level (NOAEL) level for vitamin D intake throughout her pregnancy."
"After the child is born, he or she should supplement with at least 1,000 IU/25 pounds of body weight per day. When the child reaches 125 pounds, he or she should take 5,000 IU/day. If the child shows any signs or symptoms of autism, the dose should be increased to 2,000 IU/per day/per 25 pounds of body weight."

An Immune Disorder at the Root of Autism - New York Times Aug 2012
immune dysregulation in the womb. Lists many viral and other problems during pregnancy which increase probability of autistic child by 2X to 5X
Moises Velasquez-Manoff is the author of “An Epidemic of Absence: A New Way of Understanding Allergies and Autoimmune Diseases.”

Epidemiology - July 2011Reduced chance of having autistic child by 40% by having pre-natal vitamins (most have just 400 IU of vitamin D, some have 800 IU)
For certain gene types of the mother, the risk reduction due to taking pre-natal vitamins was 2.6X, 4.5X, and 7.2X

New York Times July 2011 report on a new study of autistic twins
Autism was due to shared environmental factors 58 % of the time.

CDC: report in March 2012 of a 2008 study 1 in 88 children in the U.S. in 2008 were diagnosed with an autism spectrum disorder
a 23 % increase in the last two years and 78 % in (2003-2008) for all children
110% increase for Hispanics, and 91% increase for black children (2003-2008) (this strongly points to vitamin D)Chart of ASD intelligence in 2008 study by CDC - varies a lot around the nation

Autism on TedTalk March 2014
good background, nothing about vitamin D, following chart shows the 200-400 genes associated with different forms of autism

Solving the Autism Puzzle Jan 2015 MIT Tech Review
Nothing about vitamin D nor any way to prevent/treat Autism
300 potential genes, 27 give heightened risk of autism. Autistics with the same gene have similar symptoms.
Every child born has roughly 60 new changes in their DNA sequence, and [one in] every 50 children born have at least one large rearrangement.

+"That was the ruling by the editors of the authoritative Diagnostic and Statistical Manual in 2013, but it remains controversial"
+"All autistic individuals share core features, including social and communication difficulties, unusually narrow interests, a strong need for repetition and, often, sensory issues. Yet these core features vary enormously in how they are manifested, and in how disabling they are."
+"There are huge disparities in many areas, such as language development or IQ, and in the presence or absence of co-occurring medical conditions and disabilities"

Perhaps many Females are autistic - but they have very different symptoms than males

Why It’s So Difficult to Diagnose Autism in Girls Slate Oct 2015
"Some researchers theorize that girls are better than boys at camouflaging their symptoms, particularly during highly structured interactions such as clinic visits. For instance, a colleague of mine described girls with autism as “caricatures” in social interactions. These girls may be motivated to interact, but their behaviors seem exaggerated."

The Invisible Women With Autism Atlantic Mag Oct 2015
Similar article to Slate - very interesting
Wonder if the perceived ratio of male/female will decrease in the future